diff --git a/init.el b/init.el
index f0b127c..1e60d6a 100644
--- a/init.el
+++ b/init.el
@@ -86,7 +86,7 @@
  )
 
 ;; Configure user directory and file locations.
-(defconst custom-backup-dir (concat user-emacs-directory "backups") "Preferred backup directory.")
+(defconst custom-backup-dir (concat user-emacs-directory "backups/") "Preferred backup directory.")
 (setq-default
  custom-file (concat user-emacs-directory "custom.el")          ; Use separate custom-vars file
  backup-directory-alist `((".*" . ,custom-backup-dir))          ; Set backup file directory
@@ -769,7 +769,9 @@
   :demand
   t
   :config
-  (global-undo-tree-mode))
+  (global-undo-tree-mode)
+  :custom
+  (undo-tree-history-directory-alist `(("." . ,custom-backup-dir))))
 
 ;;====================
 ;; Diff-HL (VCS Diff Highlighting)